diff --git a/flexible-spacer-block.php b/flexible-spacer-block.php
index a182824..26b2ebf 100644
--- a/flexible-spacer-block.php
+++ b/flexible-spacer-block.php
@@ -2,7 +2,7 @@
 /**
  * Plugin Name: Flexible Spacer Block
  * Description: Add white space between blocks and customize its height for each device.
- * Version: 1.2.2
+ * Version: 1.2.3
  * Author: Tetsuaki Hamano
  * Author URI: https://github.com/t-hamano
  * License: GPL2 or later
diff --git a/readme.txt b/readme.txt
index 3e57ab5..af014b3 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: gutenberg, block, spacer, responsive
 Donate link: https://www.paypal.me/thamanoJP
 Requires at least: 5.6
 Tested up to: 5.9
-Stable tag: 1.2.2
+Stable tag: 1.2.3
 Requires PHP: 7.3
 License: GPLv2 or later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
@@ -42,6 +42,11 @@ Source: https://pxhere.com/ja/photo/245
 
 == Changelog ==
 
+= 1.2.3 =
+* Change: Ensure minimum height of the block
+* Change: Minimum value of the spacer
+* Fix: Unable to change the height of spacer in WordPress 5.9.1
+
 = 1.2.2 =
 * Clean: Remove unnecessary file included in the release